Continental Cores

Continental Cores are a postulated explanation (unconfirmed) for the formation of the highland continents.

Proponents and critics of the continental core proposal are almost equally quick to point out that it is almost purely based on assumptions.

Theory
The Continental Core proposal states:
 * Subterranean volcanic activity created the Highland Continents over billions of years
 * Freshwater overflow from highland continental crests flow to lowland valleys and eventually form subterranean rivers, which flow back towards the various continental cores
 * Water is rapidly evaporated when coming in contact with continental core volcanic activity, forming perpetual geysers which produce water on highland continent surface.

Misc.
The Calderan Fissure is often cited as proof for the Continental Core proposal. Most fissures are postulated to be undetectable on the surface of the sea, but the Calderan Fissure provides unique evidence of the subterranean volcanic activity that the theory is based around.

A fringe proposal involving the elusive Kize states that the postulated subterranean rivers are what provide the opportunity for life in the cave systems the Kize live in.